Köln 2004 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Physik der Hadronen und Kerne
HK 21: Heavy Ions II
HK 21.2: Vortrag
Dienstag, 9. März 2004, 16:00–16:15, F
Event-by-event fluctuations of the mean transverse momentum at SPS energy — •Hiro Sako and Harald Appelshäuser — GSI Darmstadt, Germany
The study of event-by-event fluctuations of the mean transverse momentum MpT in ultra-relativistic nuclear collisions may provide evidence for the existence of the QCD phase transition. Significant non-statistical fluctuations at 40, 80, and 158 AGeV/c have been observed recently by the CERES collaboration (Nucl. Phys. A 727 (2003) 97). A systematic investigation of the beam energy dependence in the SPS and RHIC energy range does, however, not reveal the desired signature for the existence of a critical point in the QCD phase diagram. New results from a study of minimum bias Pb-Au collisions at 158 AGeV indicate an excess of non-statistical MpT fluctuations in semi-peripheral events over a simple extrapolation from pp. Similar observations have recently been reported at RHIC.